以前的C代码
函数调用
1 #include <stdio.h> 2 int add(int a,int b) 3 { 4 int s; 5 s=a+b; 6 return s; 7 } 8 int main() 9 { 10 printf("%d",add(3,5)); 11 getch(); 12 return 0; 13 }
不知道
1 #include <stdio.h> 2 float p(int n) 3 { 4 int s; 5 int i; 6 s=1; 7 if(n<0) 8 printf("数据出错!"); 9 else 10 for(i=1;i<=n;i++) 11 s=s*i; 12 return s; 13 } 14 float q(int n) 15 { 16 int s; 17 int i; 18 s=0; 19 if(n<0) 20 printf("数据出错!"); 21 else 22 for(i=1;i<=n;i++) 23 s=s+p(i); 24 return s; 25 } 26 int main() 27 {printf("%f",q(5)); 28 29 getch(); 30 return 0; 31 }
文件引用
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1 #include <stdio.h> 2 #include "b.c" 3 4 int main() 5 { 6 printf("%f\n",p(5)); 7 printf("%f\n",q(5)); 8 getchar(); 9 return 0; 10 }
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1 #include <stdio.h> 2 #include "a.c" 3 4 float q(int n) 5 { 6 int s; 7 int i; 8 s=0; 9 if(n<0) 10 printf("数据出错!"); 11 else 12 for(i=1;i<=n;i++) 13 s=s+p(i); 14 return s; 15 }
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1 #include <stdio.h> 2 float p(int n) 3 { 4 int s; 5 int i; 6 s=1; 7 if(n<0) 8 printf("数据出错!"); 9 else 10 for(i=1;i<=n;i++) 11 s=s*i; 12 return 0; 13 }
在文件中加法
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1 #include<stdio.h> 2 main() 3 { 4 FILE *fin,*fout; 5 int f1=1,f2=1,f3,i,n; 6 fin=fopen("pro.in","r"); 7 fout=fopen("pro.out","w"); 8 fprintf(fout,"I am hujun who is your ghost\n"); 9 fscanf(fin,"%d",&n); 10 fprintf(fout,"%d,%d,",f1,f2); 11 for(i=3;i<=n;i++) 12 { f3=f1+f2; 13 if(i==n) 14 fprintf(fout,"%d.\n",f3); 15 else 16 fprintf(fout,"%d,",f3); 17 f1=f2; 18 f2=f3; 19 } 20 fprintf(fout,"the sum is %d\n",f1+f2+f3); 21 fclose(fin); 22 fclose(fout); 23 return 0; 24 } 25 26 27 / 将数换行/
冒泡排序
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1 #include <stdio.h> 2 #include "creatdata.c" 3 #define ARRAYLEN 6 4 void BubbleSort(int a[],int n) 5 { 6 int i,j,t; 7 for(i=0;i<n-1;i++) 8 { 9 for(j=n-1;j>i;j--) 10 { 11 if(a[j-1]>a[j]) 12 { 13 t=a[j-1]; 14 a[j-1]=a[j]; 15 a[j]=t; 16 } 17 } 18 printf("第%2d遍:",i+1); 19 for(j=0;j<n;j++) 20 printf("%d ",a[j]); 21 printf("\n"); 22 } 23 } 24 void BubbleSort1(int a[],int n) 25 { 26 int i,j,t,flag=0; //flag用来标记是否发生交换 27 for(i=0;i<n-1;i++) 28 { 29 for(j=n-1;j>i;j--) 30 { 31 if(a[j-1]>a[j])//交换数据 32 { 33 t=a[j-1]; 34 a[j-1]=a[j]; 35 a[j]=t; 36 flag=1; 37 } 38 } 39 printf("第%2d遍:",i+1); 40 for(j=0;j<n;j++) 41 printf("%d ",a[j]); 42 printf("\n"); 43 if(flag==0) //没发生交换,直接跳出循环 44 break; 45 else 46 flag=0; 47 } 48 } 49 int main() 50 { 51 int i,a[ARRAYLEN]; 52 for(i=0;i<ARRAYLEN;i++) 53 a[i]=0; 54 if(!creatdata(a,ARRAYLEN,100)) 55 { 56 printf("生成随机数不成功!\n"); 57 getch(); 58 return 1; 59 } 60 printf("原数据:"); 61 for(i=0;i<ARRAYLEN;i++) 62 printf("%d ",a[i]); 63 printf("\n"); 64 BubbleSort1(a,ARRAYLEN); 65 printf("排序后:"); 66 for(i=0;i<ARRAYLEN;i++) 67 printf("%d ",a[i]); 68 printf("\n"); 69 getch(); 70 return 0; 71 }
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1 #include <stdlib.h> 2 #include <stdio.h> 3 #include <time.h> 4 int creatdata(int arr[],int n,int max) 5 { 6 int i,j,flag; 7 srand(time(0)); 8 for(i=0;i<n;i++) 9 { 10 do 11 { 12 arr[i]=rand()%100; 13 flag=0; 14 for(j=0;j<i;j++) 15 { 16 if(arr[i]==arr[j]) 17 flag=1; 18 } 19 }while(flag); 20 printf("%4d",arr[i]); 21 } 22 return 1; 23 }
求平均数
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1 /* Note:Your choice is C IDE */ 2 #include "stdio.h" 3 float aver(float a[5]) 4 { 5 int i; 6 float av,s=a[0]; 7 for(i=1;i<5;i++) 8 s=s+a[i]; 9 av=s/5; 10 return av; 11 } 12 void main() 13 { 14 float sco[5],av; 15 int i; 16 printf("\n input 5 scores: \n"); 17 for(i=0;i<5;i++) 18 scanf("%f",&sco[i]); 19 av=aver(sco); 20 printf("average score is %6.2f\n",av); 21 }
球跳高
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1 /* Note:Your choice is C IDE */ 2 #include "stdio.h" 3 main() 4 { 5 float sn=100.0,hn=sn/2; 6 int n; 7 for(n=2;n<=10;n++) 8 { 9 sn=sn+2*hn; 10 hn=hn/2; 11 } 12 printf("the total road is %f\n",sn); 13 printf("the ghost tenth is %f",hn); 14 15 }
水仙花
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1 /* Note:Your choice is C IDE */ 2 #include "stdio.h" 3 main() 4 { 5 int i,j,k,n; 6 printf("water flower is :"); 7 for(n=100;n<1000;n++) 8 { 9 i=n/100; 10 j=n/10%10; 11 k=n%10; 12 if(i*100+j*10+k==i*i*i+j*j*j+k*k*k) 13 { 14 printf("%-5",n); 15 } 16 } 17 printf("\n"); 18 }
兔子繁殖
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1 /* Note:Your choice is C IDE */ 2 #include "stdio.h" 3 main() 4 { 5 long f1,f2; 6 int i; 7 f1=f2=1; 8 for(i=1;i<21;i++) 9 { 10 printf("%12ld,%12ld",f1,f2); 11 if(i%2==0) 12 printf("\n"); 13 f1=f1+2; 14 f2=f1+f2; 15 } 16 }
分解因数
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1 /* Note:Your choice is C IDE */ 2 #include "stdio.h" 3 main() 4 { 5 int n,i; 6 printf("input the number "); 7 scanf("%d",&n); 8 printf("%d=",n); 9 for(i=2;i<n;i++) 10 { while(n!=i) 11 { 12 if(n%i==0) 13 { 14 printf("%d*",i); 15 n=n/i; 16 } 17 else 18 break; 19 } 20 } 21 printf("%d",n); 22 }
递归
1 #include <stdio.h> 2 int p(int n) 3 { 4 5 if(n==0||n==1) return 1; 6 else 7 return p(n-1)+p(n-2); 8 } 9 10 int main() 11 { 12 int i; 13 for(i=0;i<20; i++) 14 printf("%6d",p(i)); 15 16 getchar(); 17 return 0; 18 }
读取文件内数并比较大小
1 #include<stdio.h> 4 int max(p,n) 5 {
int *p,n; 6 int m,*pend; 7 m=*p; 8 pend=p+n; 9 for(p=p+1;p<pend;p++){ 10 if(*p>m) m=*p; 11 } 12 return m; 13 } 14 15 int main() 16 { 17 FILE *fin,*fout; 18 int i,num[10]; 19 fin=fopen("pro3.in","r"); 20 fout=fopen("pro3.out","w"); 21 22 for(i=0;i<10;i++){ 23 fscanf(fin,"%d",&num[i]); 24 } 25 for(i=0;i<10;i++){ 26 fprintf(fout,"%d ",num[i]); 27 } 28 fprintf(fout,"\n%d",max(num,10)); 29 30 fclose(fin); 31 fclose(fout); 32 return 0; 33 }
读文件
1 #include<stdio.h> 2 3 int main() 4 { 5 FILE *fin,*fout; 6 int i,num[10],*p; 7 fin=fopen("pro4.in","r"); 8 fout=fopen("pro4.out","w"); 9 p=num; 10 for(i=0;i<10;i++) 11 fscanf(fin,"%d",p++); 12 p=num; 13 for(i=0;i<10;i++) 14 fprintf(fout,"%d ",*p++); 15 16 fclose(fin); 17 fclose(fout); 18 return 0; 19 }
读文件
1 #include<stdio.h> 2 int main() 3 { 4 FILE *fout; 5 int a,*p; 6 7 fout=fopen("pro1.out","w"); 8 a=5; 9 p=&a; 10 fprintf(fout,"%d %d ",&a,p); 11 fprintf(fout,"%d %d ",*(&a),*p); 12 fprintf(fout,"%d ",a++); 13 fprintf(fout,"%d ",(*p)++); 14 fprintf(fout,"%d ",p); 15 fprintf(fout,"%d ",*p++); 16 fprintf(fout,"%d ",p); 17 fclose(fout); 18 return 0; 19 }
不知道
#include<stdio.h> #include<string.h> struct student {char name[20]; int chi; }stu,st[3]; int main() { FILE *fin,*fout; int i,j; fin=fopen("pro1.in","r"); fout=fopen("pro1.out","w"); for(i=0;i<3;i++) fscanf(fin,"%s%d",&st[i].name,&st[i].chi); for(i=0;i<3;i++) for(j=i+1;j<3;j++) if(st[i].chi<st[j].chi) {strcpy(stu.name,st[i].name); stu.chi=st[i].chi; strcpy(st[i].name,st[j].name); st[i].chi=st[j].chi; strcpy(st[j].name,stu.name); st[j].chi=stu.chi; } for(i=0;i<3;i++) fprintf(fout,"%s\n",st[i].name); fclose(fin); fclose(fout); return 0; }
不知道
#includ<stdio.h> int main() { FILE *fout; fout=fopen("pro1.out","w"); int a=5; int *p; *p=a; fprintf(fout,"&a=%d",&a); fprintf(fout,"p=%d",p); fprintf(fout,"*p=%d",*p); fprintf(fout,"*(&a)=%d",*(&a)); fprintf(fout,"a++=%d",a++); fprintf(fout,"(*p)++=%d",(*p)++); fprintf(fout,"*p++=%d",*p++); return 0; }
#include<stdio.h> int main() { FILE *fout; int a,*p; fout=fopen("pro1.out","w"); a=5; p=&a; fprintf(fout,"%d %d ",&a,p); fprintf(fout,"%d %d ",*(&a),*p); fprintf(fout,"%d ",a++); fprintf(fout,"%d ",(*p)++); fprintf(fout,"%d ",p); fprintf(fout,"%d ",*p++); fprintf(fout,"%d ",p); fclose(fout); return 0; }
汉诺塔
/* Note:Your choice is C IDE */ #include <stdio.h> void move(int n,int x,int y,int z) { if(n==1) printf("%c->%c\n",x,z); else { move(n-1,x,z,y); printf("%c->%c\n",x,y); move(n-1,y,x,z); } } void main() { int h; printf("\n input number: \n"); scanf("%d",&h); printf("the step to moving %2d diskes:\n",h); move(h,'a','b','c'); }
/* Note:Your choice is C IDE */ #include <stdio.h> main() { FILE *fin,*fout; int h; void move(int n,int x,int y,int z); fin=fopen("p1.in","r"); fout=fopen("p1.out","w"); fprintf(fin,"\n input number: \n"); fscanf(fin,"%d",&h); fprintf(fout,"the step to moving %2d diskes:\n",h); move(h,'a','b','c'); } void move(int n,int x,int y,int z) { FILE *fout; fout=fopen("p1.out","a+"); if(n==1) fprintf(fout,"%c->%c\n",x,z); else { move(n-1,x,z,y); fprintf(fout,"%c->%c\n",x,y); move(n-1,y,x,z); } }